autocomplete: Add AutocompleteProvider::Type enum.

chrome/browser/autocomplete/autocomplete_browsertest.cc

Index: chrome/browser/autocomplete/autocomplete_browsertest.cc
diff --git a/chrome/browser/autocomplete/autocomplete_browsertest.cc b/chrome/browser/autocomplete/autocomplete_browsertest.cc
index ca38c40f56e158d731571d1ff79b56090af615fe..0c91c9c2e8ddf4e9d3fb61bd016a1398387855bd 100644
--- a/chrome/browser/autocomplete/autocomplete_browsertest.cc
+++ b/chrome/browser/autocomplete/autocomplete_browsertest.cc
@@ -37,10 +37,9 @@ string16 AutocompleteResultAsString(const AutocompleteResult& result) {
   std::string output(base::StringPrintf("{%" PRIuS "} ", result.size()));
   for (size_t i = 0; i < result.size(); ++i) {
     AutocompleteMatch match = result.match_at(i);
-    std::string provider_name = match.provider->name();
     output.append(base::StringPrintf("[\"%s\" by \"%s\"] ",
                                      UTF16ToUTF8(match.contents).c_str(),
-                                     provider_name.c_str()));
+                                     match.provider->GetName()));
   }
   return UTF8ToUTF16(output);
 }